GENERAL HISTOLOGY

Detailed explanation-1: -False. Echinoderms do not have an exoskeleton.

Detailed explanation-2: -Echinoderms have an exoskeleton made up of spicules. These spicules are spiny structures that are made up of Calcium carbonate minerals. They are very hard and provide a tough and protective skeleton for the body. The calcareous covering is to protect them against predators.

Detailed explanation-3: -The bodies of echinoderms are made of hard calcium-based plates that are often spiny and always covered by a thin skin. The echinoderm skeleton is thus on the inside-called an endoskeleton.

Detailed explanation-4: -Echinoderms are named for their spiny skin, which is covered by a thin layer of calcium carbonate plates and spines. Adult echinoderms have radial symmetry, but larvae have bilateral symmetry. Echinoderms have a unique water vascular system, with canals that extend along each body part.

Detailed explanation-5: -echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin.